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TABLE OF CONTENTS

Page

1. General …………………………………… 3

2. Installation & Method …………………………………… 3

3. Operation …………………………………… 3

4. Adjusting Instruction …………………………………… 4

5. Maintenance …………………………………… 4

6. Drawings …………………………………… 5 & 6

1. General

This test method determines the particle size distribution of fine and coarse aggregatesby sieving. Refer to ASTM C136. The sieve shaker consists basically of a cradle forholding the sieves, a power unit and a base. The cradle consists of a platform fastened tothe lower ends of two vertical support rods. The upper ends of which are shock mountedto a horizontal support that are free to pivot about its mounting. A sieve holder, aretaining ring and nuts on the vertical support rods hold the top bar firmly against thenest of sieves.

Model H-4325: Accommodates sieve frames from 3" to 8" diameter, 10 or less fullheight and 18 or less half height plus pan and cover. Built-in timer. Motorized.

Model H-4330: Accommodates sieve frames from 8" to 12" diameter, seven 3" deep fullheight, ten 2" deep intermediate height or thirteen 1-5/8 deep half height sieves plus panand cover. Built-in timer. Motorized.

Model H-4310: Hand-cranked model similar to H-4325 for use in the field or otherlocations where electric power is not readily available.

Sieve Set: Order separately, see sieve chart.

2. Installation & Method

Sieve shakers are shipped complete and ready for operation. Remove allpacking materials. Place on sturdy and level surface. Plug power cord into anappropriately grounded outlet.

Collect the field sample according to ASTM D75 and reduce to a test sample accordingto ASTM C702. Dry to constant weight.

3. Operation

Select the sieves with mesh sizes that are to be used and stack them together beginningwith a pan at the bottom. Then the finest sieve followed by increasing coarser sieveswith the coarsest on top. Place stack of sieves in the shaker with the bottom pan restingon the cradle platform. Cover the top sieve so that the stack can be easily secured in theshaker. Secure the stack with the sieve hold-down bar on the top of the stack and screwthe nuts on the vertical support rods firmly against the holder. Adjust and tighten thenuts at the top of the vertical support rods according to the weight of the material in thesieves. The greater the weight of the load, the tighter the nuts should be. Start the motorand observe the initial sieving action to see if the sieves are fastened securely, readjustand tighten the nuts if necessary.

Set the built-in timer for the desired shake time and turn the machine on. The machinewill stop when the timer has expired.REPORTS: Weigh the materials and record the weight and percentage of the original dryweight that is retained in each individual sieve and in the bottom pan.

4. Adjusting Instruction

Select the sieves with mesh sizes that will supply the information needed and nest thembeginning with a pan on the bottom. Then the finest sieve followed by increasinglycoarser sieves with the coarsest sieve on top. Place a sample into the top sieve and placea cover on it. Place the stack of sieves on the shaker and secure with the hold-down bar,clamping it in place with the knobs on each side.

Depending on the weight of the sieve stack, an adjustment upward of the lower cradlewill be needed. Turn the large pulley and note when the eccentric drive has moved thebottom cradle to the extreme right or left of its travel. At this point the shoulder bolt andplastic sleeve should be in the middle of the vertical slot (in lower part of the cradle). Ifit is not, loosen the top clamp knobs and the hex nuts which position the bottom cradleon the threaded rods, then adjust them upward lifting the stack until the shoulder boltwith plastic sleeve is centered. Retighten the fasteners (hex nuts and knobs).

When operating correctly, the movement upward and downward of the rod springsshould be approximately equal. Test for this by hand turning the pulley one revolutionand note the spring deflections at the top and bottom of the travel. If they are not equalrepeat the adjustment until they are approximately equal. When they are approximatelyequal, normal operation can begin.

5. Maintenance

5.1 Oil the main pulley driven shaft weekly.

5.2 Maintain the nuts on the springs tight.

5.3 Check for properly adjusted sieve stack.

5.4 Periodically check all fasteners for tightness.

7. Drawings

CAUTION: Keep hands, clothing and other objects away frommoving parts when the machine is in operation.

Rev.0; March 19, 2003